181090 has 32 divisors (see below), whose sum is σ = 403200. Its totient is φ = 57024.

The previous prime is 181087. The next prime is 181123. The reversal of 181090 is 90181.

It is an alternating number because its digits alternate between odd and even.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 811 + ... + 1009.

It is an arithmetic number, because the mean of its divisors is an integer number (12600).

2¹⁸¹⁰⁹⁰ is an apocalyptic number.

181090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

181090 is an abundant number, since it is smaller than the sum of its proper divisors (222110).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

181090 is a wasteful number, since it uses less digits than its factorization.

181090 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 226.

The product of its (nonzero) digits is 72, while the sum is 19.

The square root of 181090 is about 425.5467071897. The cubic root of 181090 is about 56.5759023723.

Subtracting from 181090 its reverse (90181), we obtain a palindrome (90909).

The spelling of 181090 in words is "one hundred eighty-one thousand, ninety".